"A runner was literally banging on the door for her to come out and kicking it because they needed to come in but Misha refused to open the door."

The alleged insider said of Misha B: "She was once the favourite but has been shell-shocked by the rise in Little Mix's popularity.

"Misha went back to her diva ways this week because she was convinced she was back in the game after escaping a sing-off the week before. There is so much tension now between them all - friendship has taken a back seat."

Of claims that the change reflected a new tip for the winner, Marks & Spencer spokesperson said: "That is absolutely not the case. We have said right from the start that we would edit and change the ad."